U.S. patent number 5,090,693 [Application Number 07/707,606] was granted by the patent office on 1992-02-25 for dumbbell.
Invention is credited to Yung-Jen Liang.
United States Patent |
5,090,693 |
Liang |
February 25, 1992 |
Dumbbell
Abstract
A dumbbell comprising a handlebar having two joints at two
opposite ends for mounting a plurality of pairs of weights, wherein
said joints have each an inner thread and an outer thread; said
weights include a pair of first weights, a pair of cover weights
and at least one pair of auxiliary weights. Each first weight has a
stepped bolt hole through the central axis thereof which includes a
first bolt hole at one end and a second bolt hole at an opposite
end respectively made in size equal to the outer thread and the
inner thread on each joint. Each auxiliary weight has a screw rod
at one end in outer diameter equal to the inner thread on each
joint and a bolt hole at an opposite end in inner diameter equal to
the inner thread on each joint. Each cover weight has a screw rod
at one end in size equal to the screw rod on each auxiliary weight.
By connecting the first weights, the auxiliary weights or the cover
weights to the handlebar, the dumbbell is arranged into any of a
variety of forms.
Inventors: |
Liang; Yung-Jen (Hsiu Shui
Hsiang, Chang Hua Hsien, TW) |
Family
ID: |
24842375 |
Appl.
No.: |
07/707,606 |
Filed: |
May 30, 1991 |
Current U.S.
Class: |
482/108 |
Current CPC
Class: |
A63B
21/0726 (20130101) |
Current International
Class: |
A63B
21/06 (20060101); A63B 21/072 (20060101); A63B
021/072 () |
Field of
Search: |
;272/67,68,117,119,122,123,124,143 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Bahr; Robert
Attorney, Agent or Firm: Bacon & Thomas
Claims
I claim:
1. A dumbbell for muscular exercise, the improvement
comprising:
a handlebar comprising a metal rod covered with a layer of soft
covering for positive and comfortable grip, said metal rod having
two joints formed at two opposite ends and respectively extended
out of said soft covering, said two joints having each an inner
thread and an outer thread;
a pair of first weights having each a threaded stepped bolt hole
through the central axis thereof, said threaded stepped bolt hole
including a first bolt hole at one end and a second bolt hole
longitudinally aligned at an opposite end, said first bolt hole
having a inner diameter equal to the outer diameter on said joints,
said second bolt hole having an inner diameter equal to the inner
diameter on said joints;
at least one pair of auxiliary weights having each a screw rod at
one end longitudinally aligned with the central axis thereof and
alternatively fastened in the second bolt hole on either of said
first weights or the inner thread on either of said two joints, and
a bolt hole disposed at an opposite end longitudinally aligned with
the central axis thereof and made in size equal to said second bolt
hole on either of said first weights and the inner thread on either
of said joints; and
a pair of cover weights having each a screw rod at one end
longitudinally aligned with the central axis thereof and
alternatively fastened in the bolt hole on either of said auxiliary
weights, the second bolt hole on either of said first weights or
the inner thread on either of said joints.
2. The dumbbell according to claim 1, wherein said pair of first
weights, said at least one pair of auxiliary weights or said pair
of cover weights can be alternatively directly connected to said
two joints and, said pair of cover weights can be alternatively
directly connected to said pair of first weights or said at least
one pair of auxiliary weights.
Description
BACKGROUND OF THE INVENTION
The present invention relates to dumbbells and relates more
particularly to a built-up dumbbell which can be conveniently
alternatively set into a any of a variety of forms to suit
individual physical strength.
Dumbbell is a device very convenient and practical for muscular
exercise. Because it does not occupy much space and is inexpensive,
it is widely accepted by the people of all ages who like to
exercise the muscles. According to conventional structure, a
dumbbell is generally made of iron in a solid unit through casting
process, having two unitary, round weights joined by a short bar.
Because it is made in a solid unit, it makes transportation and
packing difficult. It is too simple in structure to sell at a
profit-yield price and therefore, few distributors would like to
promote the selling. Further, it can not be adjusted in weight to
meet individual requirement or physical condition.
To eliminate the aforesaid problems, there is disclosed an
adjustable dumbbell. This structure of adjustable dumbbell, as
shown in FIG. 6, is generally comprised of a handlebar and a
plurality of pairs of weights which are made according to the same
specification. The weights are attached to the handlebar through
screw joint by O-rings, rubber caps and lock nuts. This structure
of adjustable dumbbell is still not satisfactory in use because of
the following disadavantages.
1. It is difficult to mount or dismount the weights;
2. The fastening accessories may be damaged easily to affect the
performance of the dumbbell; and
3. Because the weights are made according to the same
specification, it can not be arranged into a variety of forms to
meet every individual's physical strength.
SUMMARY OF THE INVENTION
The present invention has been accomplished to eliminate the
aforesaid problems. It is therefore an object of the present
invention to provide a built-up dumbbell which can be conveniently
alternatively arranged into any of a variety of forms to suit
individual physical strength.
It is another object of the present invention to provide a built-up
dumbbell which has a handlebar, by which it is lifted or swung
about in the hand for muscular exercise, made in structure for
comfortable and positive grip.
It is still another object of the present invention to provide a
built-up dumbbell which is simple in structure and durable in
use.
It is still another object of the present invention to provide a
built-up dumbbell which is suitable for mass production to greatly
reduce the cost.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a dismantled perspective view of the present
invention;
FIG. 1-1 is a sectional side view showing the structure of the main
weight;
FIG. 1-2 is a sectional side view showing the structure of the
auxiliary weight;
FIG. 1-3 is a sectional side view showing the structure of the
cover weight;
FIGS. 2, 3, 4 and 5 illustrate that the present invention can be
arranged into any of a variety of forms; and
FIG. 6 is a sectional side view of the prior art.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 1, a dumbbell in accordance with the present
invention is generally comprised of a handlebar 10, a pair of main
weights 20, a pair of cover weights 40 and at least a pair of
auxiliary weights 30. The handlebar 10 by which the dumbbell is
lifted or swung about in the had for muscular exercise is comprised
of a metal rod 11 covered with a layer of soft covering 12, which
metal rod 11 has two joints 13 and 131 formed at the two opposite
ends thereof and respectively extended out of the said layer of
soft covering 12 at two opposite ends, which joints 13 and 131 have
each an inner thread 14 or 141 (not shown) and an outer thread 15
or 151. Each main weight 20, as shown in FIG. 1-1, has a stepped
bolt hole at the center, namely, a front bolt hole 21 at one end
and a back bolt hole 22 longitudinally aligned at an opposite end,
wherein the front bolt hole 21 has an inner diameter larger than
the back bolt hole 22 and suitable for fastening the outer thread
15 or 151 on the joint 13 or 131. Each auxiliary weight 30, as
shown in FIG. 1-2, has a screw rod 32 vertically disposed at the
center at one side in concentric with the central axis thereof
which has an outer thread 33 made in size suitable for fastening in
the back bolt hole 22 on the main weight 20, and a bolt hole 31
longitudinally disposed at an opposite side in alignment with said
screw rod 32 and in size equal to the back bolt hole 22 on each
main weight 20 and the inner thread 14 or 141 on the joint 13 or
131. Each cover weight 40, as shown in FIG. 1-3, has a screw rod 41
vertically disposed at one side in concentric with the central axis
thereof, which screw rod 41 has an outer thread 42 made in size
equal to the screw rod 32 on each auxiliary weight 30.
The aforesaid handlebar 10 and weights 20, 30 and 40 can be
alternatively joined into a variety of forms. In the arrangement of
FIG. 1, one pair of auxiliary weights 30 are respectively connected
between the pair of main weights 20, which are respectively
connected to the two joints 13 and 131 of the handlebar 10 through
screw joint, and the pair of cover weights 40. In the arrangement
of FIG. 2, the pair of cover weights 40 are directly respectively
attached to the pair of main weights 20 which are respectively
secured to the two joints 13 and 131 of the handlebar 10. In the
arrangement of FIG. 3, the pair of cover weights 40 are
respectively attached to the pair of auxiliary weights 30 which are
directly connected to the two joints 13 and 131 of the handlebar
10. In the arrangement of FIG. 4, the pair of cover weights are
directly attached to the two joints 13 and 131 of the handlebar 10.
There is still another alternate arrangement shown in FIG. 5,
wherein two pairs of auxiliary weights 30 and 301 are respectively
connected together and joined between the pair of main weights 20
and the pair of cover weights 40.
As indicated, the present invention is to provide a built-up
dumbbell which can be conveniently alternatively arranged into any
of a variety of forms according to personal physical
requirement.
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